sepam 20 user manual - Schneider Electric

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PE50583
PE50584
Modbus communication Configuring the communication
interfaces
SFT2841: Sepam Configuration screen.
SFT2841: communication configuration window for ACE949.
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Access to configuration parameters
The Sepam communication interfaces are configured using SFT2841 software.
The configuration parameters can be accessed from the Communication
configuration window in SFT2841.
To access this window:
b open the Sepam configuration window in SFT2841
b check the box for ACE9xx (communication interface)
b click : the Communication configuration window appears
b select the type of interface used: ACE949/ACE959/ACE937, ACE969TP or
ACE969FO
b select the Modbus communication protocol.
The configuration parameters will vary depending on the communication interface
selected: ACE949/ACE959/ACE937, ACE969TP or ACE969FO. The table below
specifies the parameters to be configured depending on the communication interface
chosen.
Parameters to be configured ACE949
ACE959
ACE937
ACE969TP ACE969FO
Physical layer parameters b b b
Fiber-optic parameters b
Modbus advanced parameters b b b
E-LAN parameters b b
Configuring the physical layer of the Modbus port
Asynchronous serial transmission is used with the following character format:
b 8 data bits
b 1 stop bit
b parity according to parameter setting.
The number of stop bits is always fixed at 1.
If a configuration with Parity has been selected, each character will contain 11 bits
(1 start bit + 8 data bits + 1parity bit + 1 stop bit)
If a No Parity configuration has been selected, each character will contain 10 bits
(1 start bit + 8 data bits + 1 stop bit).
The configuration parameters for the physical layer of the Modbus port are:
b slave number (Sepam address)
b transmission speed
b parity check type.
Parameters Authorized values Default value
Sepam address 1 to 247 1
Speed 4800, 9600, 19200 or
38400 bauds
19200 bauds
Parity None, Even or Odd Even
Configuring the ACE969FO-2 fiber-optic port
The configuration for the physical layer of the ACE969FO-2 fiber-optic port is
completed with the following 2 parameters:
b link idle state: light-on or light-off
b echo mode: with or without.
Fiber-optic parameters Authorized values Default value
Link idle state Light Off or Light On Light Off
Echo mode Yes (fiber-optic ring)
or No (fiber-optic star)
No
Note: in echo mode, the Modbus master will receive the echo of its own request before the
slave's reply. The Modbus master must be able to disregard this echo. Otherwise, it is impossible
to create a Modbus fiber-optic ring.
PCRED301005EN - 06/2008